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I have a question about Mek Deth Koptas in the Kult of Speed army list.

It says that all items of wargear taken by the Deth Kopta Mek cost an additional 5 points per item.

My question is if this applies to weapons taken by the Deth Kopta Mek.  It seems that in the Ork dex on the armory page they make a pretty clear distinction between Wargear and Weapons and the limits imposed on what you can take. 

So say if I wanted to give a Deth Kopta Mek a Bionic Bonce it'd cost +5 Points since it's wargear, but if I wanted to give him a Power Klaw and a Choppa it would only have the base points cost for those weapons. 

Or do all my weapons cost +5 points?

wargear and weapons are very different, hence why weapons dont affect your wargear limit. So weapons would not cost +5 points based on your description of the unit entry.